Microsoft Releases Emergency Update to Fix Actively Exploited Zero-Day Vulnerability in Microsoft Office
53/69 Wednesday, January 28, 2026 Microsoft has released an out-of-band security update to address an actively exploited zero-day vulnerability in Microsoft Office, tracked as CVE-2026-21509. The vulnerability affects multiple Office versions, including Office 2016, Office 2019, Office LTSC 2021, Office LTSC 2024, and Microsoft 365 Apps for Enterprise. According to Microsoft, the flaw is classified […]
